D= M/V so, D=300/40 wich is 7.5 so D= 7.5g/m3
Neutrons keep the Protons "in check", meaning Protons hold a very strong repulsive positive charge. The Neutrons counteract the repulsive force within a small space to keep the Nucleus stable.
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Answer:
The number of principle energy level increases and the number of valance electrons remain the same.
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Answer:
Displacement Reaction
Explanation:
Zinc replaces lead in Lead(ll) nitrate as zinc is more reactive than lead.